si.

definite article used before the names of those with whom the speaker and interlocutor is intimate or familiar with

Tiada satupun yang berani pada si Tigor pemberani.

Kukatakan pada si Yopi kecil, janganlah marah

definite article used before a noun referring to a particular person with a particular characteristic

Si penjual jamu itu cantik sekali.

Dia tertawa dengan si orang asing itu.

definite article used before a nickname, typically for a subject whose well-known attributes are referred to by an adjective

Namanya si Putih

Si Gendut

definite article used before animals

si kucing

synonym of kota (“city”)

apheretic form of seksi (“section”)

Used following interrogative words for emphasis

Apa si yang dicari?

Used to express verity based on the speaker's sentiment, often indicates certain contrast: truly, actually; after all, so

Tidak apalah, saya si tidak salah.

si: seventh note of a major scale